Sewage treatment plants. Building and reconstruction. Basic technical solutions. Elaboration, structure and content requirements for optimal capital expenses and operation performance
Signalling on low-voltage electrical installations in the frequency range 3 kHz to 148,5 kHz. Part 2-2. Immunity requirements for mains communications equipment and systems operating in the range of frequencies 95 kHz to 148,5 kHz and intended for use in industrial environments